Keston System s30, Инструкции по установке и обслуживанию

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19
Installation and Servicing
FLUE OUTLET
SECTION 2 - INSTALLATION
SLOPE
‘Horizontal’ flue outlet pipework MUST slope at least 1.5 degrees (26mm per metre run) downwards towards the boiler. Pipework
can be vertical. Only swept elbows can be used.
Air inlet pipework can be truly horizontal or vertical, or sloping in a downward direction towards the boiler but in each case rain, etc.,
must be prevented from entering the pipe. There must be no troughs in any of the pipework, whether it be air inlet or flue
outlet.
............. CONT’D
TERMINATION OF THE FLUE AND AIR
The flue and air pipes may terminate independently through any
external walls within the same dwelling except on opposing walls,
within the maximum lengths shown in graph below.
The air pipe must have an elbow and 150mm length of pipe
directed downwards with a termination grill fitted.
The air pipe can be situated at the side or beneath the flue pipe to
a minimum dimension of 140mm (see diagram opposite). It must
not be sited above the flue pipe.
The flue and air pipes must extend by at least 40mm from the wall
surface.
Condensing boiler emit a visible plume of water vapour from the
flue terminal, this is normal. It is the responsibility of the installer
to judiciously select a terminal location that does not cause a
nuisance.
If either the flue or air terminal is below a height of 2m from ground
level a terminal guard must be fitted.
TERMINAL POSITIONS
Flue
Pipe Elbow
Minimum Separation
140mm
Acceptable
range of air
pipe siting
Terminal
Air Pipe
150mm
MAXIMUM LENGTHS
Due to the resistance presented by extended flue length a slight reduction in maximum boiler output will occur where
combined flue and air lengths in excess of 18.0m (50mm muPVC) are used. In such cases the boiler output will be reduced by
0.6% per additional metre.
The maximum lengths of both air inlet pipe and flue outlet pipe, when no bends are used, are as detailed in graph below.
However, each bend used has an equivalent length that must be deducted from the maximum straight length stated in graph
below. Knuckle bends must not be fitted.
A 92.5º swept elbow is equivalent to 1.0m straight length. A 45º bend is equivalent to 0.5m straight length.
It is possible to have variable flue and air lengths as described within the shaded area of graph below.
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
2
6
10
14
18
22
26
30
34
38
Acceptable Operating Area
Keston System 30 - Flue & Air Pipe Length
Flue Pipe Length [m]
A
ir P
ipe
L
engt
h [m
]